my_foods=['pizza','falafel','carrot cake']
friend_foods=my_foods[:]
my_foods.append('fucker')
friend_foods.append("lover")
print('My favourite pizzas are:')
for food in my_foods:
    print(food)
print('\n')
print("My friend's favourite pizzas are:")
#print([food for food in friend_foods[:]])这样不行，因为列表解析打印出来是一个列表
for food in friend_foods[:]:
    print(food)